Android程序之一键锁屏 (1)布局文件activity_main.xml如下: RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:
Android程序之一键锁屏
(1)布局文件activity_main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" > <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="openAdmin" android:text="开启管理员权限" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:onClick="lockscreen" android:text="一键锁屏" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:onClick="uninstall" android:text="卸载软件" /> </RelativeLayout>
(2)MainActivity.java
package com.xuliugen.lockscreen; import com.itheima.lockscreen.R; import android.app.Activity; import android.app.admin.DevicePolicyManager; import android.content.ComponentName; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.widget.Toast; public class MainActivity extends Activity { /** * 设备策略服务 */ private DevicePolicyManager dpm; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); dpm = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE); } /** * 用代码去开启管理员 */ public void openAdmin(View view) { // 创建一个Intent Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN); // 我要激活谁 ComponentName mDeviceAdminSample = new ComponentName(this,MyAdmin.class); intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,mDeviceAdminSample); // 劝说用户开启管理员权限 intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,"哥们开启我可以一键锁屏,你的按钮就不会经常失灵"); startActivity(intent); } /** * 一键锁屏 */ public void lockscreen(View view) { ComponentName who = new ComponentName(this, MyAdmin.class); if (dpm.isAdminActive(who)) { dpm.lockNow();// 锁屏 dpm.resetPassword("", 0);// 设置屏蔽密码 // 清除Sdcard上的数据 // dpm.wipeData(DevicePolicyManager.WIPE_EXTERNAL_STORAGE); // 恢复出厂设置 // dpm.wipeData(0); } else { Toast.makeText(this, "还没有打开管理员权限", 1).show(); return; } } /** * 卸载当前软件 */ public void uninstall(View view) { // 1.先清除管理员权限 ComponentName mDeviceAdminSample = new ComponentName(this, MyAdmin.class); dpm.removeActiveAdmin(mDeviceAdminSample); // 2.普通应用的卸载 Intent intent = new Intent(); intent.setAction("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.setData(Uri.parse("package:" + getPackageName())); startActivity(intent); } }
(3)根据API文档可知,需要一个类继承DeviceAdminReceiver:
package com.xuliugen.lockscreen; import android.app.admin.DeviceAdminReceiver; /** * 特殊的广播接收者 * @author xuliugen */ public class MyAdmin extends DeviceAdminReceiver { }
(4)广播接受者的设置(清单文件):
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.xuliugen.lockscreen" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="10" android:targetSdkVersion="16" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.xuliugen.lockscreen.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <!-- 广播接收者 --> <receiver android:name="com.xuliugen.lockscreen.MyAdmin" android:description="@string/sample_device_admin_description" android:label="@string/sample_device_admin" android:permission="android.permission.BIND_DEVICE_ADMIN" > <meta-data android:name="android.app.device_admin" android:resource="@xml/device_admin_sample" /> <intent-filter> <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" /> </intent-filter> </receiver> </application> </manifest>
运行效果:
总结
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